Schematic Volt

This is simple IC based PWM using LM339 Circuit Diagram. PWM or Pulse Width Modulators using LM339 is an Electronic schema.The first example uses the standard op-amp oscillator schema to generate a triangular waveform which is level-shifted and fed to a comparator (e.g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one comparator.